Apache Tomcat Replay Auth via EncryptionInterceptor v8.5-11.x
CVE-2026-55955 Published on June 29, 2026
Apache Tomcat: EncryptInterceptor not protected against replay attacks
Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109.
Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue.
Weakness Type
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2026-55955 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2026-55955
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Affected Versions
Apache Software Foundation Apache Tomcat:- Version 11.0.0-M1, <= 11.0.22 is affected.
- Version 10.1.0-M1, <= 10.1.55 is affected.
- Version 9.0.13, <= 9.0.118 is affected.
- Version 8.5.38, <= 8.5.100 is affected.
- Version 7.0.100, <= 7.0.109 is affected.